That is a Sun XXI hull either from Kingston mouldings or Lesro, I have the builders drawings for her if you are interested, it should be about 35" long and 9" beam.
But somebody has put a planked deck on her not good.and the deck looks a bit high compared to the bulwarks, the raised bulwark forward and shape of the stern are the giveaways to me,and also the huge open area looks more like the Lesro job.
If the hull is sound that deck could come out and be re done and made into a nice model .